af_xdp: fix thread 0 and 1 using one txq slot
af_xdp: fix thread 0 and 1 using one txq slot

Type: fix

Signed-off-by: arikachen <8a10cce56f8048e541984dd4d194a9a5772e5afc@gmail.com>
Change-Id: Id0e98e0a1b04f2c1aba2c261b4e51fd53a4ee824

FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp